adaptive longOp for du operation

Author: sjenning

container/common/fsHandler.go

@@ -51,7 +51,6 @@ type realFsHandler struct {
 }
 
 const (
-	longOp           = time.Second
 	timeout          = 2 * time.Minute
 	maxBackoffFactor = 20
 )
@@ -60,6 +59,8 @@ const DefaultPeriod = time.Minute
 
 var _ FsHandler = &realFsHandler{}
 
+var longOp = time.Second
+
 func NewFsHandler(period time.Duration, rootfs, extraDir string, fsInfo fs.FsInfo) FsHandler {
 	return &realFsHandler{
 		lastUpdate: time.Time{},
@@ -129,6 +130,10 @@ func (fh *realFsHandler) trackUsage() {
 			duration := time.Since(start)
 			if duration > longOp {
 				glog.V(2).Infof("du and find on following dirs took %v: %v", duration, []string{fh.rootfs, fh.extraDir})
+				// adapt longOp time so that message doesn't continue to print
+				// if the long duration is persistent either because of slow
+				// disk or lots of containers.
+				longOp = longOp + time.Millisecond*100
 			}
 		}
 	}